(a) Schematic demonstration of the system and the lifting process. The force and energy change involved are highlighted). (b) Hierarchical structure of silk fibers. The single silk fiber consists of tiny silk threads.
Spider silk offers new inspiration for artificial muscle technology. The silk of the Ornithoctonus Huwena spider demonstrates impressive weight-lifting abilities with efficient, water-driven actuation. The triggered stretching behavior of muscle is inherently based in geometry, characterized by a decrease in length and increase in volume (or vice versa) in response to a change in local environment, eg humidity or heat.
“Spider silk is a natural biological material with high sensitivity to water, which inspires us to study about the interaction between spider silk and water,” said Prof. Hongwei Zhu, Tsinghua University’s School of Material Science and Engineering in Beijing and part of the collaboration. “Ornithoctonus Huwena spider is a unique species as it can be bred artificially and it spins silk of nanoscale diameter.”
Besides the shrink-stretch ability of muscles, the way in which the motion is triggered – how the muscle is actuated – is a key part of its functionality. These spider silk fibers, actuated by wate droplets, showed impressive behavior in all the ways that matter to muscle performance (or to super heroes that may need them to swing from buildings). Zhu said: “The whole process can cover a long distance with a fast speed and high efficiency, and further be rationalized through an analysis of the system’s mechanical energy.”
The team looked at the actuation process in a few different scenarios, capturing the macro dynamics of the flexing fibers with high speed imaging. They actuated bare fibers on a flat surface (microscope slide) and while dangling from a fixed point (held with tweezers) before adding a weight to the dangling configuration to test its lifting abilities. Zhu et al also investigated the micro structure of the proteins making up the fibers, revealing infrastructure leading to its hydro-reflexive action.
Electron microscopy gave a clear picture of the smooth inner threads that make up the fibrous structure, and a laser-driven technique, called Raman spectroscopy, revealed the precise conformation of the protein folding structures making up each layer. The specific molecular configurations, in this case having proteins that have a strong affinity for water and that rearrange in the presence of water, give rise to the spider silk’s actuation.
“Alpha-helices and beta-sheets are two types of secondary protein folding structures in spider silk proteins,” said Zhu. “Beta-sheets act as crosslinks between protein molecules, which are thought relevant to the tensile strength of spider silk. A-helices are polypeptide chains folded into a coiled structure, which are thought relevant to the extensibility and elasticity in spider silk protein.”
Returning the fiber back to its relaxed state (as one-use muscles are far less useful) requires only removing the water, which offers conservation along with its simplicity. With some fine tuning, there is also potential for designing the precise behavior of the shrink-stretch cycle. “In addition, as the falling water droplet can be collected and recycled, the lifting process is energy-saving and environmentally friendly,” said Zhu. “This has provided the possibility that the spider silk can act as biomimetic muscle to fetch something with low energy cost. It can be further improved to complete staged shrink-stretch behavior by designing the silk fiber’s thickness and controlling droplet’s volume.”
Understanding this remarkable material offers new insight for developing any of a number of drivable, flexible devices in the future. “The interaction between matter and liquid may result in the structural changes of materials, which can be further applied to actuators, sensors and flexible devices,” Zhu said. http://aip.scitation.org/doi/10.1063/1.4974350 https://publishing.aip.org/publishing/journal-highlights/spider-silk-demonstrates-spider-man-abilities
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